Detect when wearable connected/disconnected to/from Android phone

Question

The Pebble watch has a Intent that is globally sended when the Pebble is connected/disconnected. This allow the phone apps to know if the watch is connected or not. I have s

Answer 1

You can easily do this by extends the WearableListenerService and override onConnectedNodes() method.

Wearable Side

public class DisconnectListenerService extends WearableListenerService implements GoogleApiClient.ConnectionCallbacks {

/* the capability that the phone app would provide */
private static final String CONNECTION_STATUS_CAPABILITY_NAME = "is_connection_lost";

private GoogleApiClient mGoogleApiClient;

@Override
public void onCreate() {
    super.onCreate();
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .build();
}

@Override
public void onConnectedNodes(List<Node> connectedNodes) {
    if (mGoogleApiClient.isConnected()) {
        updateStatus();
    } else if (!mGoogleApiClient.isConnecting()) {
        mGoogleApiClient.connect();
    }
}

private void updateStatus() {
    Wearable.CapabilityApi.getCapability(
            mGoogleApiClient, CONNECTION_STATUS_CAPABILITY_NAME,
            CapabilityApi.FILTER_REACHABLE).setResultCallback(
            new ResultCallback<CapabilityApi.GetCapabilityResult>() {
                @Override
                public void onResult(CapabilityApi.GetCapabilityResult result) {
                    if (result.getStatus().isSuccess()) {
                        updateConnectionCapability(result.getCapability());
                    } else {
                        Log.e(TAG, "Failed to get capabilities, " + "status: " + result.getStatus().getStatusMessage());
                    }
                }
            });
}

private void updateConnectionCapability(CapabilityInfo capabilityInfo) {
    Set<Node> connectedNodes = capabilityInfo.getNodes();
    if (connectedNodes.isEmpty()) {
        // The connection is lost !
    } else {
        for (Node node : connectedNodes) {
            if (node.isNearby()) {
                // The connection is OK !
            }
        }
    }
}

@Override
public void onConnected(Bundle bundle) {
    updateStatus();
}

@Override
public void onConnectionSuspended(int cause) {

}

@Override
public void onDestroy() {
    if (mGoogleApiClient.isConnected() || mGoogleApiClient.isConnecting()) {
        mGoogleApiClient.disconnect();
    }
    super.onDestroy();
    }
}

Phone Side

create a xml file in values/ directory named wear.xml

<resources>
    <string-array name="android_wear_capabilities">
        <item>is_connection_lost</item>
    </string-array>
</resources>

For more, checkout the my solution in this Stack Overflow Question

Answer 2

Have you tried NodeApi, you can use getConnectedNodes

Gets a list of Nodes to which this device is currently connected.

or addListener(GoogleApiClient client, NodeApi.NodeListener listener) which

Registers a listener to receive all node events.

Then you can use callbacks from NodeApi.NodeListener

onPeerConnected(Node peer) and onPeerDisconnected(Node peer)

Answer 3

As akmal said you can get devices which are connected to the phone, But to know whether the wearable currently connected with handheld

List<Node> connectedNodes =
    Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await().getNodes();

The list contains data like this:

Node{Moto 360 6BBF, id=3b6d19bf, hops=1, isNearby=true}